13 PAPER JAM Message

Paper jams occur when paper fails to arrive at or clear the paper path sensors in the allotted time. Paper movement is monitored primarily by two paper sensors. These are described below and illustrated in Figure 7-3).

1 PS1, the Input/Registration Sensor, located in the Paper Feed Assembly.

2 PS3, Exit Sensor, monitors paper in the Fuser Assembly.

Figure 7-3 PS1 and PS3 (Paper Path Sensors) & PS5 Paper End Sensor

When troubleshooting paper jams, the door associated with the sensor must be opened and closed to clear the jam message. For instance, if PS3 (Exit Sensor) detected the paper jam, and the jam was cleared through a method other than opening the rear door, the message remains in the display until the rear door is opened and closed. Likewise, the top cover must be opened before a jam detected by PS1 is cleared.

The DC Controller monitors these sensors, and detects both the leading and trailing edge of the paper to verify that the paper clears the sensors in the allotted time. If the paper does not arrive at, or clear the sensors in the allotted time, the DC Controller senses a paper jam. The paper jam information is transferred to the Formatter PCA, which displays the 13 PAPER JAM message.

Note also that if PS5 (MP Tray or Tray 1) Paper End Sensor on the Sensor PCA is bad (Figure 7-3, item 3), a paper jam will be reported when paper is fed from the MP Tray (or Tray 1).

7-20 Troubleshooting